A trader wants to sell a watch at 25% profit. If its cost price was Rs.x more, an extra profit of Rs.50 would be made on it. find x(in Rs.)

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Let his current CP be 100.
So his current SP = 125
Profit =25

If he makes additional profit of 50, total profit = 25 + 50 =75.
This 75 is 25 % of the new CP. So calculate the new CP, you will get it as 300.
So the value of x here is 300-100 = 200

Hope it helps! kindly phrase question in a more readable way.